[readme]add anchor links for command options

README.md

@@ -52,6 +52,7 @@ $ node example/parse.js -x 3 -y 4 -n5 -abc --beep=boop --no-ding foo bar baz
 const parseArgs = require('minimist');
 ```
 
+<a name="var-argv--parseargsargs-opts"></a>
 ## const argv = parseArgs(args, opts={})
 
 Return an argument object `argv` populated with the array arguments from `args`.